interrogator

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interrogator

[in′ter·ə‚gād·ər]
(electronics)
A radar transmitter which sends out a pulse that triggers a transponder; usually combined in a single unit with a responsor, which receives the reply from a transponder and produces an output suitable for actuating a display of some navigational parameter. Also known as challenger; interrogator-transmitter.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

interrogator

i. A radar set or other electronic device that transmits an interrogation. Normally, ground-based surveillance radar beacon transmitter-receiver scanning in synchronism with primary radar continuously transmitted signals requesting replies from all cooperative airborne transponders. The received signals are mixed with the primary radar return and displayed on the same plan position indicator (PPI).
ii. An electronic device for transmitting challenging or interrogating pulses for reception and response by a transponder.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved